JDK-6859911 : G1: assert(Heap_lock->owner() != NULL, "Should be owned on this thread's behalf")
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs16
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2009-07-13
  • Updated: 2013-09-18
  • Resolved: 2011-03-08
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JDK 6 JDK 7 Other
6u18Fixed 7Fixed hs16Fixed
Related Reports
Relates :  
JDK-6855834 - G1: minimize the output when -XX:+PrintHeapAtGC is set
Description
I am getting an occasional assert w/the fatsdebug jvm during shudown
in the following code:-

 1654
 1655   // Computes the sum of the storage used by the various regions.
 1656
 1657   size_t G1CollectedHeap::used() const {
 1658     assert(Heap_lock->owner() != NULL,
 1659            "Should be owned on this thread's behalf.");
 1660     size_t result = _summary_bytes_used;
 1661     if (_cur_alloc_region != NULL)
 1662       result += _cur_alloc_region->used();
 1663     return result;
 1664   }
 1665


with the following backtrace:-

  [6] report_assertion_failure(file_name = ???, line_no = ???, message = ???) (optimized), at 0xfffffd7ffcced6fb (line ~173) in "debug.cpp"
=>[7] G1CollectedHeap::used(this = ???) (optimized), at 0xfffffd7ffce4b8e1 (line ~1663) in "g1CollectedHeap.cpp"
  [8] G1CollectedHeap::print_on(this = ???, st = ???, extended = ???) (optimized), at 0xfffffd7ffce4e21c (line ~2344) in "g1CollectedHeap.cpp"
  [9] G1CollectedHeap::print_on(this = ???, st = ???) (optimized), at 0xfffffd7ffce4e1cb (line ~2339) in "g1CollectedHeap.cpp"
  [10] Universe::print() (optimized), at 0xfffffd7ffdfe42cb (line ~1146) in "universe.cpp"
  [11] before_exit(thread = ???) (optimized), at 0xfffffd7ffd0bb8dd (line ~402) in "java.cpp"
  [12] JVM_Halt(code = ???) (optimized), at 0xfffffd7ffd289c86 (line ~341) in "jvm.cpp"
  [13] Java_java_lang_Shutdown_halt0(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ffbdd77db
  [14] 0xfffffd7ff8c1d3c1(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c1d3c1
  [15] 0xfffffd7ff8c1d3c1(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c1d3c1
  [16] 0xfffffd7ff8c05b82(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c05b82
  [17] 0xfffffd7ff8c05b82(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c05b82
  [18] 0xfffffd7ff8c05b82(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c05b82
  [19] 0xfffffd7ff8c05b82(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c05b82
  [20] 0xfffffd7ff8c05b82(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c05b82
  [21] 0xfffffd7ff8c00575(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7ff8c00575
  [22] JavaCalls::call_helper(result = ???, m = ???, args = ???, __the_thread__ = ???) (optimized), at 0xfffffd7ffd0c5543 (line ~378) in "javaCalls.cpp"
  [23] JavaCalls::call(result = ???, method = CLASS, args = ???, __the_thread__ = ???) (optimized), at 0xfffffd7ffd0c4cf5 (line ~293) in "javaCalls.cpp"
  [24] jni_invoke_static(env = ???, result = ???, receiver = ???, call_type = ???, method_id = ???, args = ???, __the_thread__ = ???) (optimized), at 0xfffffd7ffd167f08 (line ~1016) in "jni.cpp"
  [25] jni_CallStaticVoidMethod(env = ???, cls = ???, methodID = ???, ...) (optimized), at 0xfffffd7ffd188f7d (line ~1588) in "jni.cpp"
  [26] JavaMain(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x404519
  [27] _thr_setup(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7fff15d907
  [28] _lwp_start(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0xfffffd7fff15dbb0
May be reproduced with
/net/sqenfs-1.sfbay/export1/comp/vm/jdk/hsx/16/pit/b06/jdk7b65/fastdebug/solaris-sparc/bin/java -XX:+PrintGCDetails -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
originally reproduced with javac:
javac -J-XX:+PrintGCDetails -J-XX:+UnlockExperimentalVMOptions -J-XX:+UseG1GC
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot/hotspot/rev/42d84bbbecf4
22-07-2009
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/42d84bbbecf4
15-07-2009
EVALUATION The failure seems to have been introduced by recent CR 6855834. This changed the format of the print() method on the G1CollectedHeap class and now calls the used() method to get the used amount of bytes in the G1 heap. However, the used() method takes the heap lock and can introduce the issue reported.
13-07-2009
WORK AROUND do not use -XX:+PrintGCDetails
13-07-2009